Malicious PDF — malware analysis report

Static analysis result for SHA-256 aae4079526377215…

MALICIOUS

PDF

79.2 KB Created: 2021-09-07 17:51:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 2322f376f5439a62e1d4f19f1d216a47 SHA-1: 786c3fb5d2ccf2bb12a02bef701d9cc7c075e55d SHA-256: aae4079526377215607affa1574094a70a289c6f05dd844604e2c94697eea81b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious. It contains numerous external URIs and link farms pointing to compromised WordPress sites and disposable hosting, suggesting a phishing or malware distribution campaign. The presence of embedded URLs indicates an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://synerhu.ru/uplcv?utm_term=japanese+folktales+pdf PDF link annotation
    • http://firstcuwire.com/file_media/file_image/file/77791712601.pdfIn PDF document text
    • https://lensprovn.com/ckfinder/userfiles/files/5769260410.pdfIn PDF document text
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/d5q7ebcevcrqa79nu7qsbm94qi/16115583297.pdfIn PDF document text
    • http://romanakladatelstvi.cz/userfiles/file/95110995412.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1611ad02811db7---tuxejerememalowu.pdfIn PDF document text
    • https://lapakunited.com/contents//files/luwanigetuviku.pdfIn PDF document text
    • http://udaybharat.in/ckfinder/userfiles/files/86104763541.pdfIn PDF document text
    • https://www.asahinadigital.com/wp-content/plugins/super-forms/uploads/php/files/f04uoiin23td0cuc1t1h1ppcu5/guzazisebijodazefaxokovu.pdfIn PDF document text
    • https://www.urban-quartz.co.uk/wp-content/plugins/super-forms/uploads/php/files/52d4516b16797648a84ca222b4813bb6/jimurilojigobadaworogep.pdfIn PDF document text
    • https://zapcdn.space/web/img/podborky/files/59712433842.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071bafa27277---levej.pdfIn PDF document text
    • http://creativetechno.in/userfiles/file/nidibebemitewisazefetopog.pdfIn PDF document text
    • https://southernlightingsource.com/wp-content/plugins/super-forms/uploads/php/files/f762aa66168e13fd4f5b5bcc0ce2a7c0/gokeb.pdfIn PDF document text
    • http://hasici-pristroje-eshop.cz/files/file/23847434355.pdfIn PDF document text
    • http://dunakeszi.varosom.hu/userfiles/files/fubixa.pdfIn PDF document text
    • https://palcev.ru/userfiles/file/rarilofonatupez.pdfIn PDF document text
    • http://datavincity.com/uploads/ckfinder/files/keluzunojegonebafupu.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3e3f0418a3---98100464941.pdfIn PDF document text
    • http://alliance-ic.ru/uploads/file/dunixofakakevudodu.pdfIn PDF document text
    • http://podushka.by/files/files/lagipaluz.pdfIn PDF document text
    • http://wabasnb.com/files/fckeditor/file/145233760660d1f781b1c5a.pdfIn PDF document text
    • https://arabacioyunlar.com/calisma2/files/uploads/nidanipebebetosezogisafip.pdfIn PDF document text
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16114ce3d1ce1a---22291270133.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cb7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB7E 20428 bytes
SHA-256: 08c6f9701182e0ba49669a254c5c6d36f4a61b1008fb891dd6cc331960211cdd
font_01_sfnt_off00010020.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10020 10384 bytes
SHA-256: a77a6b127536744c2579c6c8958fd3196a19f2a1cc30134975c871873374e4f5
font_02_sfnt_off000117c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117C9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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